Details

4640-B Surface Thin Layer Density Gauge

About Troxler Products

Troxler Electronic Laboratories, Inc. is a world leader in the manufacturing of testing/quality control measurement equipment for the construction industry. We are recognized worldwide as the industry standard for Nuclear Moisture/Density Gauges. In addition to nuclear gauges, Troxler is also a leader in the production of Gyratory Compactors and Asphalt Ignition Ovens. Troxler continues to set new product standards of quality and precision in the construction industry. For a complete list of Troxler equipment, please review this Products section.

Recognizing the need for an improved method of measuring the density of thin layer asphalt overlays, Troxler developed the first true thin layer density gauge, the 4640-B Surface Thin Layer Density Gauge.

Designed to measure the density of thin asphalt and concrete layers from 2.5 to 10 cm (1 - 4 inches), the Troxler Model 4640-B Thin Layer Density Gauge accurately measures the overlay density without influence from underlying material. No nomographs or manual corrections are required in order to compute the true density of the overlay. With onsite results available in as little as one minute, the Model 4640-B can provide the user with test results when they are needed, not hours after compaction has been completed.

Special Functions

  • Automatic standard count comparison and storage
  • Data storage of 750 records for later viewing, printing, and/or downloading
  • Determination of the count time for selected precision
  • Field offsets of density and a special calibration function
  • Calculator mode
  • Diagnostics and self-test modes
  • Simple data transfer to a portable device using the free Troxler App

The Troxler Model 4640-B Thin Layer Density Gauge complies with ASTM D2950 and AASHTO T 355.

Specifications

Measurement 
Gauge Precision ±1 std. deviation at 2240 kg/m3 [140 pcf])

Time (minutes)
Thickness
kg/m3
pcf
1
2.5 cm (1")
±16
±1.0
5.0 cm (2")
±10
±0.6
6.3 cm (2.5")
±8
±0.5
4
2.5 cm (1")
±8
±0.5
5.0 cm (2")
±5
±0.3
6.3 cm (2.5")
±4
±0.25
Depth of Measurement 25-100 mm (1-4 inches)
 
Calibration
Accuracy of Density Standards ±0.3%
Calibration Range 100-170 pcf (1600-2700 kg/m3) Density
 
Radiological
Gamma Source 8 ±1 mCi Cesium-137
Troxler Drawing Number

TEL A-102112

Source Housing Stainless Steel Encapsulation (single or double)
Shielding Tungsten and lead
Surface Dose Rates 5 mrem/hr max. top and sides of gauge
15 mrem/hr max. bottom of gauge, gamma in shield position
Shipping Case DOT 7A, Type A, Yellow II Label, 0.2 Transport Index
Sealed source approved for domestic and international shipment CS-127, Special Form Certificate
GB:SFC 140
 
Electrical
Stored Energy 30 watt-hours
Battery Recharge Time 14-16 hours (automatic cutoff)
Charge Source

110/220 VAC, 50-60 Hz or 12-14 V DC

Power Consumption 0.1t6 watt-hours
Readout

4x16 alpha-numeric LCD

 
Mechanical
Case Colored polycarbonate top shell with aluminum cast base
Operating Temperature 32º to 122º F  (0º to 50º C)
Gauge size without handles 18.6 x 9.1 x 6.2 inches
(472 x 231 x 158 mm)
Gauge height with handles 9.5 inches (240 mm)
Storage Temperature 0º to 140º F  (-18º to +60º C)
Weight 29.7 lbs. (13.5 kg)
Shipping Weight 90 lbs. (40.8 kg) with case

Options

The Model 4640-B provides you with these advantages:

  • True thin layer gauge - no nomograph calculations needed
  • No need to measure the density of base materials
  • Stores up to 750 test results
  • twelve month warranty

 

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